Youtube on Firefox for me is awful. I get constant buffering on 1080p+ content. Chrome is flawless. I have the same extensions on both browsers, curious if anyone else has experienced the same recently?
I watch a lot of YT content through FF and it has worked fine on both Windows and MacOS / OS X for a long time.
https://addons.mozilla.org/en-US/firefox/addon/youtube-class...
TLDR: YouTube uses some obsolete technologies that aren't supported in non webkit browsers.